Aim. To investigate the influence of the nutrition system and predecessors on crop yields and crop rotation productivity in the conditions of unstable moisture zone of the Left–Bank Forest–Steppe of Ukraine. Methods. Generally accepted – field, laboratory, mathematical, comparative and calculation. Results. It was established that five–field crop rotations: A – perennial grasses – winter wheat – sugar beet – corn for grain – spring barley, B – peas – winter wheat – sugar beet – corn for grain – corn for grain due to the crop rotation factor and natural soil fertility on average for 2016–2023. ensured winter wheat yields of 3.3–3.5 t/ha, corn after sugar beet – 7.2–7.28 t / ha, corn in re–sowing – 7.41 t/ha, spring barley – 2.4 t/ha, peas for grain – 2.2 t/ha, sugar beet – 28.0–28.2 t/ha. These data can be used to calculate the nutrition system in the farms of the Left Bank Forest–Steppe of Ukraine. Conclusions. It was found that the most optimal and cost–effective dose of fertilizer per 1 ha of arable land N45P49K61 in the ratio of 0.92:1.0:1.24 contributed to an increase in grain yield by 6.1%, fodder units by 10.8%, and net profit by 6.6% compared to the dose of fertilizer N31P33K41, double dose of fertilizer and calculated doses of fertilizer with different ratios of nutrients, although they increase the yield, do not cover the cost of fertiliser. The productivity of the crop rotation area per 1 ha of arable land was higher in the crop rotation with a saturation of 80% of cereals, including 40% of corn for grain, 20% of industrial crops, and 20% of legumes.
Demydenko et al. (2025) studied this question.